Lanthanum hydride doped tungsten-based coating fabricated by supersonic atmospheric plasma spraying

被引：8

作者：

Hou, Qing Yu ^{[1
,2
]}

Luo, Lai Ma ^{[1
]}

Huang, Zhen Yi ^{[2
]}

Wang, Ping ^{[2
]}

Ding, Ting Ting ^{[2
]}

Wu, Yu Cheng ^{[1
]}

机构：

[1] Hefei Univ Technol, Lab Nonferrous Met Mat & Proc Engn Anhui Prov, Hefei 230009, Anhui, Peoples R China

[2] Anhui Key Lab Met Mat & Proc, Maanshan 243002, Anhui, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2016年 / 299卷

基金：

中国博士后科学基金;

关键词：

Supersonic atmospheric plasma spraying; W/La2O3 composite coating; Rare earth hydrides; Elastic failure; Fracture toughness; MECHANICAL-PROPERTIES; MICROSTRUCTURE; HARDNESS; COMPOSITES; PRESSURE; BEHAVIOR; FRACTURE; CRACKING; MODULUS; COPPER;

D O I：

10.1016/j.surfcoat.2016.05.012

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this work, as a kind of rare earth hydrides, 1.5 wt.% LaH2 powder was introduced into a tungsten powder and then deposited by a supersonic atmospheric plasma spraying (SAPS) machine. The purpose was to form La2O3 in the LaH2-doped tungsten-based coating. The microstructure and properties of the undoped and LaH2-doped tungsten-based coatings were characterized using scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), X-ray diffractometer (XRD), nano-indentation tester and Vickers hardness tester. The results showed that SAPS coatings exhibited typical lamellar microstructure. Pores located mainly at lamellar gaps in association with oxidation were also observed. The type of tungsten oxide was mainly WO3. During SAPS process, La2O3 was formed in the LaH2-doped tungsten-based coating by the transformation of LaH2. The formed La2O3 was distributed mainly at lamellar gaps, having a joining effect on the adjacent lamellae. The oxygen content, porosity and thermal conductivity of the LaH2-doped tungsten-based coating were lower than those of the undoped tungsten coating. The introduction of 1.5 wt.% LaH2 in the tungsten coating improved its ability to resist elastic fracture and improved its fracture toughness. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：153 / 161

页数：9

共 42 条

[21] Relationships between hardness, Young's modulus and elastic recovery in hard nanocomposite coatings [J].

Musil, J ;

Kunc, F ;

Zeman, H ;

Poláková, H .

SURFACE & COATINGS TECHNOLOGY, 2002, 154 (2-3) :304-313

[22]

Naumkin A, NIST XRAY PHOTOELECT

[23] Comparison of W-Cu composite coatings fabricated by atmospheric and vacuum plasma spray processes [J].

Niu, Yaran ;

Lu, Dan ;

Huang, Liping ;

Zhao, Jun ;

Zheng, Xuebin ;

Chen, Guang .

VACUUM, 2015, 117 :98-103

[24] Microstructure and thermal property of tungsten coatings prepared by vacuum plasma spraying technology [J].

Niu, Yaran ;

Zheng, Xuebin ;

Ji, Heng ;

Qi, Lingjun ;

Ding, Chuanxian ;

Chen, Junling ;

Luo, Guangnan .

FUSION ENGINEERING AND DESIGN, 2010, 85 (7-9) :1521-1526

[25] Interfacial microstructures and hardness distributions of vacuum plasma spraying W-coated ODS ferritic steels for fusion plasma facing applications [J].

Noh, Sanghoon ;

Kasada, Ryuta ;

Kimura, Akihiko ;

Nagasaka, Takuya ;

Sokolov, Mikhail A. ;

Kim, Tae Kyu .

FUSION ENGINEERING AND DESIGN, 2014, 89 (04) :289-293

[26] AN IMPROVED TECHNIQUE FOR DETERMINING HARDNESS AND ELASTIC-MODULUS USING LOAD AND DISPLACEMENT SENSING INDENTATION EXPERIMENTS [J].

OLIVER, WC ;

PHARR, GM .

JOURNAL OF MATERIALS RESEARCH, 1992, 7 (06) :1564-1583

[27] Effect of Annealing with Pressure on Tungsten Film Properties Fabricated by Atmospheric Plasma Spray [J].

Park, Jun Young ;

Yang, Seung Jae ;

Jin, Young Gil ;

Park, Chong Rae ;

Kim, Gon Ho ;

Han, Heung Nam .

METALS AND MATERIALS INTERNATIONAL, 2014, 20 (06) :1037-1042

[28] Measurement of mechanical properties by ultra-low load indentation [J].

Pharr, GM .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1998, 253 (1-2) :151-159

[29] Tungsten as material for plasma-facing components in fusion devices [J].

Philipps, V. .

JOURNAL OF NUCLEAR MATERIALS, 2011, 415 (01) :S2-S9

[30] Structure and property evaluation of a vacuum plasma sprayed nanostructured tungsten-hafnium carbide bulk composite [J].

Rea, K. E. ;

Viswanathan, V. ;

Kruize, A. ;

De Hosson, J. Th. M. ;

O'Dell, S. ;

McKechnie, T. ;

Rajagopalan, S. ;

Vaidyanathan, R. ;

Seal, S. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 477 (1-2) :350-357

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